The Difference Between Constant Voltage And Constant Current Power Supply

The meaning of constant voltage power supply and constant current power supply is similar. Constant current power supply mainly refers to the constant current, that is to say, no matter how the voltage changes, its current change will not be particularly large, almost no change. It's just that in our daily life, constant voltage power supply is more common, rather than constant current power supply. What is the difference between these two power sources?

In our lives, constant voltage power supplies are used more. For example, batteries and dry cells are constant voltage power supplies. For the mains in life, we can also understand it as an AC constant voltage power supply, because their output voltage is basically It has not changed, it will not change because of the change of current.

In the constant current power supply, if the resistance of the load is too large, the current output by the power supply cannot reach its constant current value. In this case, the output voltage of the constant current source will automatically rise to the maximum output voltage of the power supply, only When the load resistance value drops to a certain level, let the output current of the power supply reach the constant current size, and the power supply will really be in constant current operation. If the resistance of the load decreases, the output voltage will drop according to this law, which can make The output current remains constant.

What is the difference between a constant voltage power supply and a constant current power supply? In fact, whether it is a constant voltage power supply or a constant current power supply, their essence is the same, their outputs are close to the same, and their outputs are both current and voltage. Among these two quantities, the power supply can often only control which One quantity is either a stable current or a stable voltage, and the other quantity is often determined by the responsible resistance. The size of the responsible resistor is determined by the user.